Why you should use 2-step verification
2-step verification adds an extra layer of security to your Google Account by requiring you to have access to your phone – as well as your username and password – when you sign in. This means that if someone steals or guesses your password, the potential hijacker still can't sign in to your account because they don't have your phone.
Thank you Google
How you sign in with 2-step verification
1- When you want to access Google products from your browser, go to that product and enter your username and password.
2- You'll next be prompted to enter your verification code, which you'll get from your phone. You'll only have to do this once every 30 days if you so choose.
3- Soon after you turn on 2-step verification, non-browser applications and devices that use your Google Account (such as Gmail on your phone or Outlook), will stop working. You'll then have to sign in using your username and a special password you generate for this application. (Don't worry, you'll only have to do this once for each device or application.) --- more detail
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